Aball kicked with avelocity of 9m/s at an angle of 50 digree the horizontal find maximum height

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value

This is the number of complete movements of a wave per second.

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.